Tide mark

Tide comes in, tide goes out, tide comes in, tide goes out, tide comes in, tide goes out, tide comes in, tide goes out, tide comes in, tide goes out, tide comes in, tide goes out, tide comes in, tide goes out, tide comes in, tide goes out, tide comes in, tide goes out..........

https://www.youtube.com/watch?v=7nqcL0mjMjw